// -------------------------------------------------
// BlinKit - BlinKit Library
// -------------------------------------------------
//   File Name: DataObject.h
// Description: DataObject Class
//      Author: Ziming Li
//     Created: 2021-07-28
// -------------------------------------------------
// Copyright (C) 2021 MingYang Software Technology.
// -------------------------------------------------

/*
 * Copyright (c) 2008, 2009, Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef DataObject_h
#define DataObject_h

#include "core/CoreExport.h"
#include "core/clipboard/DataObjectItem.h"
#include "platform/PasteMode.h"
#include "platform/Supplementable.h"
#include "platform/heap/Handle.h"
#include "wtf/ListHashSet.h"
#include "wtf/PassRefPtr.h"
#include "wtf/Vector.h"
#include "wtf/text/StringHash.h"
#include "wtf/text/WTFString.h"

namespace blink {

class KURL;
class SharedBuffer;
class WebDragData;

// A data object for holding data that would be in a clipboard or moved
// during a drag-n-drop operation. This is the data that WebCore is aware
// of and is not specific to a platform.
class CORE_EXPORT DataObject : public BlinKit::GCObject // BKTODO: , public HeapSupplementable<DataObject> {
{
    USING_GARBAGE_COLLECTED_MIXIN(DataObject);
public:
    static GCRefPtr<DataObject> createFromPasteboard(PasteMode);
    static GCRefPtr<DataObject> create();
    // BKTODO: static DataObject* create(WebDragData);

    virtual ~DataObject();

    // DataTransferItemList support.
    size_t length() const;
    DataObjectItem* item(unsigned long index);
    // FIXME: Implement V8DataTransferItemList::indexedPropertyDeleter to get this called.
    void deleteItem(unsigned long index);
    void clearAll();
    // Returns null if an item already exists with the provided type.
    DataObjectItem* add(const String& data, const String& type);
    DataObjectItem* add(File*);

    // WebCore helpers.
    void clearData(const String& type);

    ListHashSet<String> types() const;
    String getData(const String& type) const;
    void setData(const String& type, const String& data);

    void urlAndTitle(String& url, String* title = 0) const;
    void setURLAndTitle(const String& url, const String& title);
    void htmlAndBaseURL(String& html, KURL& baseURL) const;
    void setHTMLAndBaseURL(const String& html, const KURL& baseURL);

    // Used for dragging in files from the desktop.
    bool containsFilenames() const;
    Vector<String> filenames() const;
    void addFilename(const String& filename, const String& displayName);

    // Used for dragging in filesystem from the desktop.
    void setFilesystemId(const String& fileSystemId) { m_filesystemId = fileSystemId; }
    const String& filesystemId() const { ASSERT(!m_filesystemId.isEmpty()); return m_filesystemId; }

    // Used to handle files (images) being dragged out.
    void addSharedBuffer(const String& name, const std::shared_ptr<SharedBuffer> &);

    int modifiers() const { return m_modifiers; }
    void setModifiers(int modifiers) { m_modifiers = modifiers; }

    DECLARE_TRACE();

    // BKTODO: WebDragData toWebDragData();

private:
    DataObject();

    DataObjectItem* findStringItem(const String& type) const;
    bool internalAddStringItem(DataObjectItem*);
    void internalAddFileItem(DataObjectItem*);

    HeapVector<Member<DataObjectItem>> m_itemList;

    // State of Shift/Ctrl/Alt/Meta keys and Left/Right/Middle mouse buttons
    int m_modifiers;
    String m_filesystemId;
};

} // namespace blink

#endif
